Journal cover Journal topic
Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
Journal topic

Journal metrics

IF value: 3.668
IF3.668
IF 5-year value: 3.707
IF 5-year
3.707
CiteScore value: 6.3
CiteScore
6.3
SNIP value: 1.383
SNIP1.383
IPP value: 3.75
IPP3.75
SJR value: 1.525
SJR1.525
Scimago H <br class='widget-line-break'>index value: 77
Scimago H
index
77
h5-index value: 49
h5-index49
Preprints
https://doi.org/10.5194/amt-2020-209
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-2020-209
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  16 Jun 2020

16 Jun 2020

Review status
A revised version of this preprint was accepted for the journal AMT and is expected to appear here in due course.

A portable, robust, stable and tunable calibration source for gas-phase nitrous acid (HONO)

Melodie Lao1, Leigh R. Crilley1, Leyla Salehpoor1, Teles C. Furlani1, Ilann Bourgeois2,3, J. Andrew Neuman2,3, Andrew W. Rollins2, Patrick R. Veres2, Rebecca A. Washenfelder2, Caroline C. Womack2,3, Cora J. Young1, and Trevor C. VandenBoer1 Melodie Lao et al.
  • 1Department of Chemistry, York University, Toronto, ON
  • 2NOAA Chemical Sciences Laboratory, Boulder, CO
  • 3Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO

Abstract. Atmospheric HONO mixing ratios in indoor and outdoor environments span a range of less than a few parts per trillion by volume (pptv) up to tens of parts per billion by volume (ppbv) in combustion plumes. Previous HONO calibration sources have utilized proton transfer acid displacement from nitrite salts or solutions, with output that ranges from tens to thousands of ppbv. Instrument calibrations have thus required large dilution flows to obtain atmospherically relevant mixing ratios. Here we present a simple universal source to reach very low HONO calibration mixing ratios using a nitrite-coated reaction device with the addition of humid air and/or HCl from a permeation device. The calibration source developed in this work can generate HONO across the atmospherically relevant range and has high purity (90–99 %), reproducibility, and tunability. Mixing ratios at the tens of pptv level are easily reached with reasonable dilution flows. The calibration source can be assembled to start producing stable HONO mixing ratios (RSE ≤ 2 %) within two hours, with output concentrations varying ≤ 25 % following simulated transport or complete disassembly of the instrument, and ≤ 10 % under ideal conditions. The simplicity of this source makes it highly versatile for field and lab experiments. The platform facilitates a new level of accuracy in established instrumentation, as well as intercomparison studies to identify systematic HONO measurement bias and interferences.

Melodie Lao et al.

Interactive discussion

Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement

Interactive discussion

Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement

Melodie Lao et al.

Melodie Lao et al.

Viewed

Total article views: 205 (including HTML, PDF, and XML)
HTML PDF XML Total Supplement BibTeX EndNote
119 71 15 205 27 13 13
  • HTML: 119
  • PDF: 71
  • XML: 15
  • Total: 205
  • Supplement: 27
  • BibTeX: 13
  • EndNote: 13
Views and downloads (calculated since 16 Jun 2020)
Cumulative views and downloads (calculated since 16 Jun 2020)

Viewed (geographical distribution)

Total article views: 255 (including HTML, PDF, and XML) Thereof 254 with geography defined and 1 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 

Cited

Saved

No saved metrics found.

Discussed

No discussed metrics found.
Latest update: 21 Sep 2020
Publications Copernicus
Download
Short summary
Nitrous acid (HONO) is a key intermediate in the generation of oxidants and fate of nitrogen oxides in the atmosphere. High purity calibration sources that produce stable atmospherically relevant levels under field conditions have not been made to date, reducing measurement accuracy. In this study a simple salt-coated tube humidified with water vapour is demonstrated to produce pure stable low levels of HONO, with other approaches allowing the generation of higher amounts.
Nitrous acid (HONO) is a key intermediate in the generation of oxidants and fate of nitrogen...
Citation